Jar opener



FIG. 1 is a front perspective view of a jar opener;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof, with the broken line portion showing environmental subject matter which forms no part of the claimed design. 

The ornamental design for a jar opener, as shown and described. 